Error is not a mere accident of an untrained intellect, but a necessary stage or feature or moment of the expression of the truth.

Lectures on Modern Idealism (1919), p. 79

We are all aware, if we have ever tried it, how empty and ghostly is a life lived for a long while in absolute solitude. Free me from my fellows, let me alone to work out the salvation of my own glorious self, and surely (so I may fancy) I shall now for the first time show who I am. No, not so; on the contrary I merely show in such a case who I am not. I am no longer friend, brother, companion, co-worker, servant, citizen, father, son; I exist for nobody; and ere-long, perhaps to my surprise, generally to my horror, I discover that I am nobody.